Lesson Worksheet: Exterior Angles of a Triangle Mathematics • 8th Grade

In this worksheet, we will practice finding the measure of the exterior angle of a triangle and comparing between an exterior angle and its corresponding remote interior angles.


The figure shows some angles identified on triangle 𝐴𝐵𝐶.

Identify which angle is an exterior angle.

  • A𝑦
  • B𝑥
  • C𝑧

Identify which angle is an interior angle.

  • A𝑧
  • B𝑥
  • C𝑦


Is the measure of two right angles less than, equal to or greater than the sum of the interior angles of a triangle?

  • Aless than
  • Bgreater than
  • Cequal to


What is the measure of an exterior angle of an equilateral triangle?


True or False: It is possible to draw a triangle on a plane with two obtuse angles.

  • ATrue
  • BFalse

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